(;GM[1]FF[4]SZ[19]
GN[Black to play]
PC[https://senseis.xmp.net/?IgoHatsuyoRonProblem19/Solution]AP[GoWiki:2009]
DT[2023-01-30]
C[Diagram from https://senseis.xmp.net/?IgoHatsuyoRonProblem19/Solution

Black to play]
PL[B]

AB[oa][ib][kb][ob][fc][kc][mc][pc][qc][gd][nd][fe][oe][qf]
AW[mb][nb][pb][gc][hc][jc][oc][rc][kd][ld][md][rd][ne][qe][nf][pf][pg]

;B[nc]C[B1]MN[1]
;W[lc]C[W2]MN[2]
;B[od]C[B3]MN[3]
;W[qb]C[W4]MN[4]
;B[of]C[B5]MN[5]
;W[og]C[W6]MN[6]
;B[lb]C[B7]MN[7]
;W[jb]C[W8]MN[8]
;B[la]C[B9]MN[9]
;W[pd]C[W10]MN[10]

;
)
